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## <a name="Known_Limitations_and_Fixes"> Known Limitations and Fixes </a>
When comparing the Hurd (and its [[Mach/GnuMach]] microkernel) to alternatives please remember that the last released version number is 0.3. For example, Linux, the kernel, took awhile to mature. The Debian GNU/Hurd system is developing rapidly. Assistance with programming and support tasks is greatly appreciated. The general [Hardware Compatibility Guide](http://www.freesoftware.fsf.org/thug/gnumach_hardware.html) is another good reference.
Now, the list of known limitations of the Hurd.
* ~1.5+ GB ext2 partition size limit
* See [[ExtTwoSize]]
* Missing device drivers.
* Current [[Mach/GnuMach]] drivers are from Linux 2.0.
* [[Mach/OskitMach]] currently has Linux 2.2 drivers.
* Swap is [highly recommended](http://www.gnu.org/software/hurd/faq.en.html#q2-7), like on UNIX systems.
* Minimum of 8 MB RAM has been reported to work, but 32 MB is more realistic. Don't forget to use plenty of swap space.
* 768 megabytes RAM maximum [approximately](http://www.freesoftware.fsf.org/thug/gnumach_hardware.html#Memory). If you've got too much use GRUB's `uppermem` command to limit the amount seen by Mach.
* Random devices, /dev/random and /dev/urandom, are not in the main distribution yet. These are needed by, for instance, OpenSSH.
* In progress, see [[RandomDevice]]
* No DHCP client will work yet.
* See [[DhcpClient]] - need to update TCP/IP server.
* There are some [[Distrib/SystemAPILimits]]
* PthreadsLibrary not in CDs or tarballs yet.
* May not be true anymore [[Distrib/TarballNotes20030126]] provides new Hurd libraries
* See [[PosixThreads]]
* Sound support missing (in progress)
* [[Mach/OskitMach]] can provide, but no work yet
* PPP support, e.g., um-pppd missing.
* See [[PppDaemon]]
* USB support is missing
* Xfree86 is stabilizing
* `fatfs` translator is stabilizing, and it does not have partition limits that get in the way. ([0\.4 released Oct 6, 2002](http://mail.gnu.org/pipermail/bug-hurd/2002-October/010576.html))
* [Ext3 implementation](http://debian.fmi.uni-sofia.bg/~ogi/hurd/ext3fs/) is very unstable.
* Portability between alternate microkernels, e.g., [darwin](http://developer.apple.com/darwin/) & [L4](http://os.inf.tu-dresden.de/L4/)
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